Provide ways to eliminate, remove, and prevent electrical hazards in the workplace.

Emphasizing the extreme importance of observing all electrical safety requirements and practices.

Instructing you on what to do in the event an electrical accident.

4Purpose

Course is not designed to teach you to work on electrical equipment.

You will not be qualified to work on electrical equipment .

If you see problems with electrical equipment, notify your supervisor.

5Basic Concepts of Electricity

Electricity is the flow of electrons (current) through a conductor.

Requires a source of power usually a generating station.

Travels in a closed circuit.

When you become part of the circuit, the injury may be fatal.

6Hazard Recognition

Cords Equipment

Power tools and extension cords must be inspected each time they are used.

They must be taken out of service immediately upon discovery of worn or broken insulation.

7Hazard Recognition

Cords Equipment

Visually inspect electrical equipment before each use for damage and/or external defects such as loose, missing or deformed parts, pinched or crushed outer jackets or insulation. This type of external damage may indicate internal damage to the equipment.

Electrical cords that are worn or damaged must be replaced without delay.

Before cleaning electrical equipment, turn it off and unplug it.

8Hazard Recognition

Electrical Panels

Electric panels must be kept clear of any obstructions at all times.

Storage is not allowed in electrical vault or service panel rooms. Find another place for storage of materials, products, etc.

9Hazard Recognition

Trip Hazards

Dont cause tripping hazards or create pinch points for cords.

If you must run a cord temporarily across the floor, protect your co-workers by covering the cord appropriately.

10Hazard Recognition

Exposed Wiring

Assume all exposed wiring is energized until proven otherwise.

Stop, protect the area, and contact supervision if you encounter this situation.

11Hazard Recognition

Power Strips

Never daisy chain multi-outlet strips (plugging into each other)

12Hazard Recognition

Junction boxes, pull boxes, and fittings must have approved covers in place.

Unused openings in cabinets, boxes, and fittings must be closed (no missing knockouts).

Report these situations to your supervisor.

13Effects of Electricity on the Human Body

The four major types of electrical injuries are

Direct

Electrocution

Electrical Shock

Burns

Indirect

Falls

14Effects of Electricity on the Human Body Electrical Shock

Received when current passes through the body.

Severity of the shock depends on

Path of current through the body.

Amount of current flowing through the body.

Length of time the body is in the circuit.

15Effects of Electricity on the Human Body Electrical Shock

Range of currents lasting 1 second will illicit the following reactions

1 milliamp

Just a faint tingle.

5 milliamps

Slight shock felt. Most people can let go.

6-30 milliamps

Painful shock. Muscular control is lost. This is the range were freezing current starts. It may not be possible to let go.

Example A person 2 ft. away from a 25,000-amp arc feels a force of about 480 lbs on the front of the body.

May cause copper and aluminum components to melt.

The molten metal can be blasted great distances by the pressure wave.

23Effects of Electricity on the Human Body Falls

Electric shock can also cause indirect injuries.

Workers in elevated locations who experience a shock may fall, resulting in serious injury or death.

24Electrical Hazard Protections

Insulation

Grounding

Guarding

Electrical protective devices

Personal Protective Equipment

Safe work practices

25Electrical Hazard Protections

Insulation

Plastic or rubber coverings that does not conduct electricity.

Insulation prevents live wires from coming in contact with people thus protecting them form electrical shock.

26Electrical Hazard Protections

Grounding

Grounding is another method of protecting you from electric shock.

However, it is normally a secondary protective measure.

27Electrical Hazard Protections

Grounding

The "ground" refers to a conductive body, usually the earth, and means a conductive connection, whether intentional or accidental, by which an electric circuit or equipment is connected to earth or the ground plane.

By "grounding" a tool or electrical system, a low-resistance path to the earth is intentionally created.

28Electrical Hazard Protections

Guarding

A type of isolation that uses various structures to close off live electrical parts.

These structures include

Boxes

Screens

Covers

Partitions

29Electrical Hazard Protections

Ground Fault Circuit Interrupters (GFCI)

Detects the difference in current between two circuits wires.

This difference in current could happen when electrical equipment isnt working correctly.

GFCI are set at about 5mA and are designed to protect workers and not equipment.

30Electrical Hazard Protections

Fuses and Circuit Breakers

Fuses and circuit breakers are intended primarily for the protection of conductors and equipment.

They prevent over-heating of wires and components that might otherwise create hazards for operators.

They also open the circuit under certain hazardous ground-fault conditions.

31Electrical Hazard Protections

Personal Protective Equipment

Foot protection

Footwear will be marked EH if its approved for electrical work.

EH Electrical Hazard

Footwear must be kept dry, even if it is marked EH

32Electrical Hazard Protections

Personal Protective Equipment

Head protection

Hard hat (insulated - nonconductive)

Class B E.

Always wear your hat with the bill forward.

Do not store anything in the top of your hat while wearing it.

33Electrical Hazard Protections

Personal Protective Equipment

Hand protection

Rubber insulating gloves.

Classified by the level of voltage and protection they provide.

Should always be worn over rubber insulating gloves to provide the mechanical protection needed against cuts, abrasions, and punctures.

Use electrical tools and equipment that are protected by a GFIReview your assignments with your supervisors

Utilize correct PPE

Report all problems to your supervisors

If at all in doubt, ask questions

46Video

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